test(podman): use public Alpine reference image

Signed-off-by: Evan Lezar <elezar@nvidia.com>

Author: elezar

tests/ansible/playbooks/drivers/podman/default-userns-baseline.yaml

@@ -6,7 +6,7 @@
   hosts: all
   gather_facts: false
   vars:
-    podman_reference_image: "{{ openshell_conformance_image }}"
+    podman_reference_image: "{{ openshell_podman_reference_image }}"
     podman_reference_uid_map: /var/lib/openshell-test-inputs/podman/reference-uid-map
   tasks:
     - name: Wait for SSH
@@ -67,6 +67,16 @@
         group: tmachine
         mode: "0700"
 
+    - name: Pull the Podman reference image
+      become: true
+      become_user: tmachine
+      ansible.builtin.command:
+        argv: [podman, pull, "{{ podman_reference_image }}"]
+      environment:
+        HOME: /home/tmachine
+        XDG_RUNTIME_DIR: "/run/user/{{ tmachine_uid.stdout }}"
+      changed_when: false
+
     - name: Capture direct Podman default UID mapping
       become: true
       become_user: tmachine

tests/ansible/playbooks/drivers/podman/userns-profile.yaml

@@ -6,7 +6,7 @@
   hosts: all
   gather_facts: false
   vars:
-    podman_reference_image: "{{ openshell_conformance_image }}"
+    podman_reference_image: "{{ openshell_podman_reference_image }}"
     podman_reference_uid_map: /var/lib/openshell-test-inputs/podman/reference-uid-map
   tasks:
     - name: Wait for SSH

tests/config.nix

@@ -128,9 +128,9 @@ let
         ];
         inputs = {
           openshell_podman_test_bundle = "../artifacts/test-archives/${muslTarget}/openshell-podman-tests.tar";
-          # The tarball is built from a digest-pinned Alpine image, then tagged
-          # explicitly so its name is stable after the installer loads it.
-          openshell_conformance_image = "localhost/openshell/conformance:tmachine";
+          # Use the same public image as the compiled driver default so direct
+          # Podman and OpenShell containers exercise identical image metadata.
+          openshell_podman_reference_image = "docker.io/library/alpine:3.22";
           openshell_podman_userns_auto_config = "suites/drivers/podman/fixtures/userns-auto.toml";
           openshell_podman_userns_keep_id_config = "suites/drivers/podman/fixtures/userns-keep-id.toml";
           openshell_podman_userns_private_config = "suites/drivers/podman/fixtures/userns-private.toml";